Box Solar Cookers

Collection Contents:

A simple box solar cooker works by reflecting sunlight from its lid into the box.
Can you work out a relationship between the angle of the sunlight and the best angle to open the lid?
Can you prove it?

The solar concentration ratio of a solar cooker is the ratio of the amount of sunlight concentrated on the target to the size of the target.
This model presents the best situation for a given lid angle, and lets you see how much light can be captured at that lid angle.
The question is: what lid angle captures the most sunlight?